In 36 years with three school districts, Bull counts his sick days on one hand -- five -- and tallies just as many in 13 years as a carrier, first as a substitute in 2000 and then as a full-timer in 2007. The temperatures he works in can swing 120 degrees Fahrenheit, from 115 (46 Celsius) in the summer to below zero in the winter’s wind.

Five years ago, the snow and ice were so deep on the road that his power steering gave out. He zigged and zagged and tore through an electric fence, leaving a hole for 50 head of cattle to roam free. He pushed on the gas, nudging the truck out of trouble and on to the nearest farm for help.

“You just never know what might happen,” Bull says over rib-eye and potato salad at his favorite steakhouse.